modify vs modifiable

modify is not an adjective while modifiable is an adjective.

Word	Noun	Adjective	Verb	Adverb
modify	No	No	Yes	No
modifiable	No	Yes	No	No

modify (adjective)	modifiable (adjective)
	capable of being modified in form or character or strength (especially by making less extreme)

modify (verb)	modifiable (verb)
make less severe or harsh or extreme
add a modifier to a constituent
cause to change; make different; cause a transformation