<pre>
Repeated:
 disclosure -> clue -> cue
 expurgated -> purged -> pure
 frangible -> fragile -> frail

Two-way:
 chariot -> cart, car
 container -> can, tin
 community -> county, city
 deteriorated -> rot, die
 feasted -> ate, fed
 rampage -> rage, rape
 routine -> rote, rut

Reverse two-way:
 exhilaration, exultation -> elation
 irritated, infuriated -> irate
 jollity, jocularity -> joy
 playfulness, facetiousness -> fun
 postured, positioned -> posed
 lighted, illuminated -> lit
 observe, spectate -> see
 formalities, christenings -> rites
 brobdingnagian, lumbering -> big
 feast, breakfast -> eat
 purged, pasteurized -> pure
 expostulate, stipulate -> state

Reverse three-way:
 enthusiast, neurotic, nougat -> nut
 perversion, misdoing, transgression -> sin
 slinky, slipperly, stealthy -> sly

Reverse many-way:
 falsities, falsifies, fallacies, calumnies, plagiarizes, hyperbolizes,
  reclines -> lies
 deceased, departed, deactivated, decayed, decimated, decapitated,
  deteriorated, disintegrated, desiccated -> dead

Two-way (one antonym):
 encourage -> urge, enrage
 feast -> eat, fast

One-way:
 accurate -> acute
 adroitness -> art
 appropriate -> apt
 astound -> stun
 barren -> bare
 bitterness -> ire
 blossom -> bloom
 catacomb -> tomb
 charisma -> charm
 compartment -> pen
 dazzle -> daze
 elevate -> elate
 flourishing -> lush
 grenadine -> red
 himself -> he
 interregnum -> term
 knapsack -> pack
 loneliness -> oneness
 municipality -> city
 myself -> me
 nourished -> nursed
 overbearing -> vain
 pastille -> pill
 perambulate -> ramble
 plagiarist -> liar
 precocious -> precious
 quiescent -> quiet
 rapscallion -> rascal
 satisfied -> sate
 scoundrel -> cur
 secure -> sure
 stingy -> tiny
 supervisor -> superior
 tolerate -> let
 twitch -> tic
 variegated -> varied
 welded -> wed
 yearning -> yen

Antonyn:
 avoid -> aid
 deify -> defy
 friend -> fiend
 gullible -> glib
 intimidated -> intimate
 patriarch -> pariah

Adjacent:
 aberrant -> errant
 accident -> dent
 belated -> late
 blotch -> blot
 cartoon -> art
 cavern -> cave
 enjoyment -> joy
 exist -> is
 factual -> actual
 history -> story
 ramble -> amble
 perimeter -> rim
 umpteenth -> nth

Related etymology:
 amicable -> amiable
 armaments -> arms
 contradictory -> contrary
 circumambulate -> circulate
 cleansed -> cleaned
 definitive -> definite
 disembark -> debark
 equitable -> equal
 hyperbole -> hype
 imagining -> imaging
 incapability -> inability
 market -> mart
 nestled -> nested
 obligated -> obliged
 pantaloons -> pants
 partially -> partly
 platter -> plate
 prattle -> prate
 primeval -> primal
 primordial -> primal
 revolution -> revolt
 staiate -> sate
 splatter -> spatter
 splutter -> sputter
 technological -> technical
 trustworthy -> trusty
</pre>
