basic vs rudimentary

basic is a noun but rudimentary is not a noun.

Word	Noun	Adjective	Verb	Adverb
basic	Yes	Yes	No	No
rudimentary	No	Yes	No	No

basic (noun)	rudimentary (noun)
(usually in the plural) a necessary commodity for which demand is constant

basic (adjective)	rudimentary (adjective)
pertaining to or constituting a base or basis	being or involving basic facts or principles
of or denoting or of the nature of or containing a base	being in the earliest stages of development
reduced to the simplest and most significant form possible without loss of generality	not fully developed in mature animals
serving as a base or starting point