austere vs spartan

austere and spartan both are adjectives.

Word	Noun	Adjective	Verb	Adverb
austere	No	Yes	No	No
spartan	No	Yes	No	No

As adjectives, austere and spartan are synonyms defined as:

Other synonyms of austere include ascetic, ascetical.

austere (adjective)	spartan (adjective)
practicing great self-denial	practicing great self-denial
of a stern or strict bearing or demeanor; forbidding in aspect	unsparing and uncompromising in discipline or judgment
severely simple	resolute in the face of pain or danger or adversity