big bedbug vs conenose bug

big bedbug and conenose bug both are nouns.

Word	Noun	Adjective	Verb	Adverb
big bedbug	Yes	No	No	No
conenose bug	Yes	No	No	No

As nouns, big bedbug and conenose bug are synonyms defined as:

Other synonyms of big bedbug include cone-nosed bug, conenose, kissing bug.

big bedbug (noun)	conenose bug (noun)
large bloodsucking bug	large bloodsucking bug