outcaste vs casteless

outcaste is a noun but casteless is not a noun.

Word	Noun	Adjective	Verb	Adverb
outcaste	Yes	Yes	No	No
casteless	No	Yes	No	No

As adjectives, outcaste and casteless are synonyms defined as:

outcaste and casteless: not belonging to or having been expelled from a caste and thus having no place or status in society

outcaste (noun)	casteless (noun)
a person belonging to no caste

outcaste (adjective)	casteless (adjective)
not belonging to or having been expelled from a caste and thus having no place or status in society	not belonging to or having been expelled from a caste and thus having no place or status in society