isinglass vs biotite

isinglass and biotite both are nouns.

Word	Noun	Adjective	Verb	Adverb
isinglass	Yes	No	No	No
biotite	Yes	No	No	No

As nouns, biotite is a hyponym of isinglass; that is, biotite is a word with a more specific, narrower meaning than isinglass:

isinglass: any of various minerals consisting of hydrous silicates of aluminum or potassium etc. that crystallize in forms that allow perfect cleavage into very thin leaves; used as dielectrics because of their resistance to electricity
biotite: dark brown to black mica found in igneous and metamorphic rock

Other hyponyms of isinglass include lepidolite, muscovite, paragonite, phlogopite, zinnwaldite.

isinglass (noun)	biotite (noun)
any of various minerals consisting of hydrous silicates of aluminum or potassium etc. that crystallize in forms that allow perfect cleavage into very thin leaves; used as dielectrics because of their resistance to electricity	dark brown to black mica found in igneous and metamorphic rock