circularize vs modify

circularize and modify both are verbs.

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

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

Other hypernyms of circularize include alter, change.

circularize (verb)	modify (verb)
make circular	make less severe or harsh or extreme
cause to become widely known	add a modifier to a constituent
distribute circulars to	cause to change; make different; cause a transformation
canvass by distributing letters
canvass by using a questionnaire