undifferentiated vs uniform

undifferentiated is not a noun while uniform is a noun.

Word	Noun	Adjective	Verb	Adverb
undifferentiated	No	Yes	No	No
uniform	Yes	Yes	Yes	No

As adjectives, undifferentiated and uniform are synonyms defined as:

undifferentiated (noun)	uniform (noun)
	clothing of distinctive design worn by members of a particular group as a means of identification

undifferentiated (adjective)	uniform (adjective)
not differentiated	always the same; showing a single form or character in all occurrences
	not differentiated
	the same throughout in structure or composition
	evenly spaced

undifferentiated (verb)	uniform (verb)
	provide with uniforms