algin vs alginic acid

algin and alginic acid both are nouns.

Word	Noun	Adjective	Verb	Adverb
algin	Yes	No	No	No
alginic acid	Yes	No	No	No

As nouns, algin and alginic acid are synonyms defined as:

algin and alginic acid: a gum used especially as a thickener or emulsifier

algin (noun)	alginic acid (noun)
a gum used especially as a thickener or emulsifier	a gum used especially as a thickener or emulsifier