pipe vs meerschaum

pipe and meerschaum both are nouns.

Word	Noun	Adjective	Verb	Adverb
pipe	Yes	No	Yes	No
meerschaum	Yes	No	No	No

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

pipe (noun)	meerschaum (noun)
a long tube made of metal or plastic that is used to carry water or oil or gas etc.	a pipe having a bowl made of meerschaum
a tube with a small bowl at one end; used for smoking tobacco	a white clayey mineral
the flues and stops on a pipe organ
a tubular wind instrument
a hollow cylindrical shape