basic assumption vs self-evident truth

basic assumption and self-evident truth both are nouns.

Word	Noun	Adjective	Verb	Adverb
basic assumption	Yes	No	No	No
self-evident truth	Yes	No	No	No

As nouns, basic assumption and self-evident truth are synonyms defined as:

basic assumption and self-evident truth: an assumption that is basic to an argument

Other synonyms of basic assumption include constatation.

basic assumption (noun)	self-evident truth (noun)
an assumption that is basic to an argument	an assumption that is basic to an argument