agar vs agar-agar

agar and agar-agar both are nouns.

Word	Noun	Adjective	Verb	Adverb
agar	Yes	No	No	No
agar-agar	Yes	No	No	No

As nouns, agar and agar-agar are synonyms defined as:

agar and agar-agar: a colloidal extract of algae; used especially in culture media and as a gelling agent in foods

agar (noun)	agar-agar (noun)
a colloidal extract of algae; used especially in culture media and as a gelling agent in foods	a colloidal extract of algae; used especially in culture media and as a gelling agent in foods
any culture medium that uses agar as the gelling agent