glacier mill vs slideway

glacier mill and slideway both are nouns.

Word	Noun	Adjective	Verb	Adverb
glacier mill	Yes	No	No	No
slideway	Yes	No	No	No

As nouns, slideway is a hypernym of glacier mill; that is, slideway is a word with a broader meaning than glacier mill:

glacier mill: a chute through which supraglacial water enters a glacier, boring either to the bedrock or to the depth of common crevasse formation
slideway: sloping channel through which things can descend

Other hypernyms of glacier mill include chute, slide, sloping trough.

glacier mill (noun)	slideway (noun)
a chute through which supraglacial water enters a glacier, boring either to the bedrock or to the depth of common crevasse formation	sloping channel through which things can descend