abridger vs abbreviator

abridger and abbreviator both are nouns.

Word	Noun	Adjective	Verb	Adverb
abridger	Yes	No	No	No
abbreviator	Yes	No	No	No

As nouns, abridger and abbreviator are synonyms defined as:

abridger and abbreviator: one who shortens or abridges or condenses a written work

abridger (noun)	abbreviator (noun)
one who shortens or abridges or condenses a written work	one who shortens or abridges or condenses a written work