abridgment vs summary

abridgment and summary both are nouns.

Word	Noun	Adjective	Verb	Adverb
abridgment	Yes	No	No	No
summary	Yes	Yes	No	No

As nouns, summary is a hypernym of abridgment; that is, summary is a word with a broader meaning than abridgment:

Other hypernyms of abridgment include sum-up.

abridgment (noun)	summary (noun)
a shortened version of a written work	a brief statement that presents the main points in a concise form

abridgment (adjective)	summary (adjective)
	briefly giving the gist of something
	performed speedily and without formality