lye vs potash

lye and potash both are nouns.

Word	Noun	Adjective	Verb	Adverb
lye	Yes	No	No	No
potash	Yes	No	No	No

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

Other hyponyms of lye include caustic potash, potassium hydroxide, caustic soda, sodium hydroxide.

lye (noun)	potash (noun)
a strong solution of sodium or potassium hydroxide	a potassium compound often used in agriculture and industry