dumdum bullet vs dumdum

dumdum bullet and dumdum both are nouns.

Word	Noun	Adjective	Verb	Adverb
dumdum bullet	Yes	No	No	No
dumdum	Yes	No	No	No

As nouns, dumdum bullet and dumdum are synonyms defined as:

dumdum bullet and dumdum: a soft-nosed small-arms bullet that expands when it hits a target and causes a gaping wound

dumdum bullet (noun)	dumdum (noun)
a soft-nosed small-arms bullet that expands when it hits a target and causes a gaping wound	a soft-nosed small-arms bullet that expands when it hits a target and causes a gaping wound