stumblebum vs lump

stumblebum and lump both are nouns.

Word	Noun	Adjective	Verb	Adverb
stumblebum	Yes	No	No	No
lump	Yes	No	Yes	No

As nouns, stumblebum and lump are synonyms defined as:

Other synonyms of stumblebum include clod, gawk, goon, lout, lubber, lummox, oaf.

stumblebum (noun)	lump (noun)
an awkward stupid person	a compact mass
a second-rate prize fighter	a large piece of something without definite shape
	an awkward stupid person
	an abnormal protuberance or localized enlargement

stumblebum (verb)	lump (verb)
	group or chunk together in a certain order or place side by side
	put together indiscriminately