different between superhard vs ultrahard

English

super- +? hard

superhard (comparative more superhard, superlative most superhard)

Having a very high hardness.
(not comparable, mineralogy) Having a hardness between that of boron nitride and diamond.

superhard (plural superhards)

(motorsports) Ellipsis of superhard tyre (A tyre whose compound is harder than hards, and therefore harder than mediums, softs.)

ultra- +? hard

ultrahard (comparative more ultrahard, superlative most ultrahard)

ultrahard (not comparable)

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