darken vs modify

darken and modify both are verbs.

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

As verbs, modify is a hypernym of darken; that is, modify is a word with a broader meaning than darken:

Other hypernyms of darken include alter, change.

darken (verb)	modify (verb)
become dark or darker	make less severe or harsh or extreme
make dark or darker	add a modifier to a constituent
tarnish or stain	cause to change; make different; cause a transformation