terra cotta vs terracotta

terra cotta and terracotta both are nouns.

Word	Noun	Adjective	Verb	Adverb
terra cotta	Yes	No	No	No
terracotta	Yes	No	No	No

As nouns, terra cotta and terracotta are synonyms defined as:

terra cotta (noun)	terracotta (noun)
a hard unglazed brownish-red earthenware	a hard unglazed brownish-red earthenware
a brownish orange color that resembles Terra cotta.