big bedbug vs cone-nosed bug

big bedbug and cone-nosed bug both are nouns.

Word	Noun	Adjective	Verb	Adverb
big bedbug	Yes	No	No	No
cone-nosed bug	Yes	No	No	No

As nouns, big bedbug and cone-nosed bug are synonyms defined as:

Other synonyms of big bedbug include conenose, conenose bug, kissing bug.

big bedbug (noun)	cone-nosed bug (noun)
large bloodsucking bug	large bloodsucking bug