7 Chars:
10 INANELY
 7 INANEST
10 INANITY
12 INAPTLY
10 INARMED
10 INBEING
10 INBOARD
10 INBOUND
10 INBREDS
10 INBREED
 9 INBUILT
 9 INBURST
11 INCAGED
10 INCAGES
 9 INCANTS
10 INCASED
 9 INCASES
 9 INCENSE
11 INCEPTS
 9 INCESTS
13 INCHING
11 INCIPIT
 9 INCISAL
10 INCISED
 9 INCISES
 9 INCISOR
10 INCITED
 9 INCITER
 9 INCITES
12 INCIVIL
11 INCLASP
 9 INCLINE
11 INCLIPS
 9 INCLOSE
10 INCLUDE
11 INCOMER
11 INCOMES
 9 INCONNU
 9 INCROSS
 9 INCRUST
11 INCUBUS
10 INCUDAL
10 INCUDES
12 INCURVE
10 INCUSED
 9 INCUSES
10 INDABAS
10 INDAMIN
 8 INDENES
 8 INDENTS
16 INDEXED
15 INDEXER
15 INDEXES
10 INDICAN
10 INDICES
10 INDICIA
10 INDICTS
 9 INDIGEN
 9 INDIGOS
 9 INDITED
 8 INDITER
 8 INDITES
10 INDIUMS
 8 INDOLES
 8 INDOORS
 8 INDORSE
12 INDOWED
18 INDOXYL
11 INDRAFT
11 INDRAWN
11 INDUCED
10 INDUCER
10 INDUCES
10 INDUCTS
 9 INDUING
 9 INDULGE
 8 INDULIN
 8 INDULTS
 8 INDUSIA
11 INDWELL
11 INDWELT
10 INEARTH
 8 INEDITA
12 INEPTLY
 7 INERTIA
10 INERTLY
16 INEXACT
10 INFALLS
15 INFANCY
10 INFANTA
10 INFANTE
10 INFANTS
12 INFARCT
10 INFARES
10 INFAUNA
12 INFECTS
16 INFEOFF
10 INFERNO
10 INFESTS
11 INFIDEL
11 INFIELD
14 INFIGHT
12 INFIRMS
18 INFIXED
17 INFIXES
12 INFLAME
10 INFLATE
12 INFLECT
12 INFLICT
13 INFLOWS
11 INFOLDS
12 INFORMS
12 INFRACT
11 INFUSED
10 INFUSER
10 INFUSES
 8 INGATES
 8 INGENUE
 8 INGESTA
 8 INGESTS
 9 INGOING
 9 INGOTED
11 INGRAFT
 8 INGRAIN
 8 INGRATE
 8 INGRESS
10 INGROUP
11 INGROWN
11 INGULFS
12 INHABIT
11 INHALED
10 INHALER
10 INHALES
10 INHAULS
11 INHERED
10 INHERES
10 INHERIT
12 INHIBIN
12 INHIBIT
12 INHUMAN
13 INHUMED
12 INHUMER
12 INHUMES
 7 INITIAL
16 INJECTS
15 INJURED
14 INJURER
14 INJURES
13 INKBLOT
14 INKHORN
11 INKIEST
11 INKLESS
15 INKLIKE
12 INKLING
13 INKPOTS
14 INKWELL
15 INKWOOD
10 INLACED
 9 INLACES
 8 INLANDS
10 INLAYER
 7 INLIERS
 9 INMATES
 8 INNARDS
10 INNERLY
10 INNERVE
 8 INNINGS
 7 INNLESS
 9 INOCULA
 7 INOSITE
12 INPHASE
 9 INPOURS
16 INQUEST
16 INQUIET
16 INQUIRE
19 INQUIRY
 8 INROADS
 7 INSANER
11 INSCAPE
11 INSCULP
 9 INSEAMS
 9 INSECTS
 7 INSERTS
10 INSHORE
 8 INSIDER
 8 INSIDES
11 INSIGHT
 8 INSIGNE
10 INSIPID
 7 INSISTS
 7 INSNARE
10 INSOFAR
 7 INSOLES
 7 INSOULS
 9 INSPANS
11 INSPECT
 9 INSPIRE
 7 INSTALL
 7 INSTALS
 7 INSTANT
 7 INSTARS
 7 INSTATE
 8 INSTEAD
 9 INSTEPS
 7 INSTILL
 7 INSTILS
 7 INSULAR
 7 INSULIN
 7 INSULTS
 8 INSURED
 7 INSURER
 7 INSURES
12 INSWEPT
 8 INTAGLI
11 INTAKES
 8 INTEGER
 8 INTENDS
 7 INTENSE
 7 INTENTS
 9 INTERIM
 7 INTERNE
 7 INTERNS
10 INTHRAL
 9 INTIMAE
 9 INTIMAL
 9 INTIMAS
 7 INTINES
 7 INTITLE
11 INTOMBS
 8 INTONED
 7 INTONER
 7 INTONES
 7 INTORTS
 7 INTRANT
 7 INTREAT
13 INTROFY
 7 INTROIT
 7 INTRONS
 8 INTRUDE
 7 INTRUST
 7 INTUITS
 7 INTURNS
10 INTWINE
10 INTWIST
 7 INULASE
 7 INULINS
 8 INURING
 8 INURNED
 7 INUTILE
12 INVADED
11 INVADER
11 INVADES
11 INVALID
14 INVEIGH
10 INVENTS
10 INVERSE
10 INVERTS
10 INVESTS
10 INVITAL
11 INVITED
10 INVITEE
10 INVITER
10 INVITES
12 INVOICE
15 INVOKED
14 INVOKER
14 INVOKES
13 INVOLVE
10 INWALLS
11 INWARDS
13 INWEAVE
11 INWINDS
11 INWOUND
13 INWOVEN
12 INWRAPS

6 Chars:
 6 INANER
 6 INANES
11 INARCH
 8 INARMS
 8 INBORN
 9 INBRED
 9 INCAGE
 8 INCANT
 8 INCASE
10 INCEPT
 8 INCEST
12 INCHED
11 INCHES
 8 INCISE
 8 INCITE
10 INCLIP
 9 INCOGS
10 INCOME
11 INCONY
10 INCUBI
 8 INCULT
 8 INCURS
 8 INCUSE
 9 INDABA
 8 INDEED
 7 INDENE
 7 INDENT
 9 INDICT
 7 INDIES
 8 INDIGN
 8 INDIGO
 7 INDITE
 9 INDIUM
 7 INDOLE
 7 INDOLS
 7 INDOOR
10 INDOWS
 7 INDRIS
 9 INDUCE
 9 INDUCT
 8 INDUED
 7 INDUES
 7 INDULT
 6 INERTS
 9 INFALL
14 INFAMY
 9 INFANT
 9 INFARE
11 INFECT
 9 INFERS
 9 INFEST
11 INFIRM
12 INFLOW
16 INFLUX
10 INFOLD
11 INFORM
 9 INFUSE
 7 INGATE
 7 INGEST
 7 INGLES
 7 INGOTS
10 INGULF
 9 INHALE
 9 INHAUL
 9 INHERE
11 INHUME
15 INJECT
13 INJURE
16 INJURY
10 INKERS
10 INKIER
11 INKING
17 INKJET
10 INKLES
12 INKPOT
 8 INLACE
 7 INLAID
 7 INLAND
 9 INLAYS
 6 INLETS
 6 INLIER
 8 INMATE
11 INMESH
 8 INMOST
 6 INNATE
 6 INNERS
 7 INNING
 8 INPOUR
 8 INPUTS
 7 INROAD
 9 INRUSH
 6 INSANE
 8 INSEAM
 8 INSECT
 6 INSERT
 6 INSETS
 7 INSIDE
 6 INSIST
 6 INSOLE
 6 INSOUL
 8 INSPAN
 6 INSTAL
 6 INSTAR
 8 INSTEP
 6 INSTIL
 6 INSULT
 6 INSURE
 8 INTACT
10 INTAKE
 7 INTEND
 6 INTENT
 6 INTERN
 6 INTERS
 8 INTIMA
 8 INTIME
 6 INTINE
10 INTOMB
 6 INTONE
 6 INTORT
 9 INTOWN
 6 INTRON
 6 INTROS
 6 INTUIT
 6 INTURN
 6 INULIN
 7 INURED
 6 INURES
 6 INURNS
10 INVADE
 9 INVARS
 9 INVENT
 9 INVERT
 9 INVEST
 9 INVITE
13 INVOKE
 9 INWALL
10 INWARD
10 INWIND
12 INWOVE
11 INWRAP

5 Chars:
 5 INANE
 7 INAPT
 7 INARM
10 INBYE
 8 INCOG
 7 INCUR
 7 INCUS
13 INDEX
 6 INDIE
 6 INDOL
 9 INDOW
 6 INDRI
 6 INDUE
 7 INEPT
 5 INERT
 8 INFER
15 INFIX
 8 INFOS
 8 INFRA
 6 INGLE
 6 INGOT
 5 INION
10 INKED
 9 INKER
 9 INKLE
 8 INLAY
 5 INLET
 6 INNED
 5 INNER
 7 INPUT
 5 INSET
 5 INTER
 5 INTIS
 5 INTRO
 5 INURE
 5 INURN
 8 INVAR

4 Chars:
 9 INBY
 9 INCH
 7 INFO
 4 INIA
 8 INKS
11 INKY
 7 INLY
 4 INNS
 4 INRO
 4 INTI
 4 INTO

3 Chars:
 7 INK
 3 INN
 3 INS

2 Chars:
 2 IN