Plexiglas vs plexiglass

Plexiglas and plexiglass both are nouns.

Word	Noun	Adjective	Verb	Adverb
Plexiglas	Yes	No	No	No
plexiglass	Yes	No	No	No

As nouns, Plexiglas and plexiglass are synonyms defined as:

Plexiglas and plexiglass: a light transparent weather resistant thermoplastic

Plexiglas (noun)	plexiglass (noun)
a light transparent weather resistant thermoplastic	a light transparent weather resistant thermoplastic