self-evident truth vs basic assumption

self-evident truth and basic assumption both are nouns.

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

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

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

Other synonyms of self-evident truth include constatation.

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