cyder vs hard cider

cyder and hard cider both are nouns.

Word	Noun	Adjective	Verb	Adverb
cyder	Yes	No	No	No
hard cider	Yes	No	No	No

As nouns, hard cider is a hyponym of cyder; that is, hard cider is a word with a more specific, narrower meaning than cyder:

cyder: a beverage made from juice pressed from apples
hard cider: alcoholic drink from fermented cider; `cider' and `cyder' are European (especially British) usages for the fermented beverage

Other hyponyms of cyder include scrumpy, sweet cider.

cyder (noun)	hard cider (noun)
a beverage made from juice pressed from apples	alcoholic drink from fermented cider; `cider' and `cyder' are European (especially British) usages for the fermented beverage