bomb vs flush it

bomb is a noun but flush it is not a noun.

Word	Noun	Adjective	Verb	Adverb
bomb	Yes	No	Yes	No
flush it	No	No	Yes	No

As verbs, bomb and flush it are synonyms defined as:

Other synonyms of bomb include fail, flunk.

bomb (noun)	flush it (noun)
an explosive device fused to explode under specific conditions
strong sealed vessel for measuring heat of combustion
an event that fails badly or is totally ineffectual

bomb (verb)	flush it (verb)
throw bombs at or attack with bombs	fail to get a passing grade
fail to get a passing grade