ruff vs overtrump

ruff is a noun but overtrump is not a noun.

Word	Noun	Adjective	Verb	Adverb
ruff	Yes	No	Yes	No
overtrump	No	No	Yes	No

As verbs, overtrump is a hyponym of ruff; that is, overtrump is a word with a more specific, narrower meaning than ruff:

Other hyponyms of ruff include crossruff.

ruff (noun)	overtrump (noun)
(card games) the act of taking a trick with a trump when unable to follow suit
common Eurasian sandpiper; the male has an erectile neck ruff in breeding season
a high tight collar
an external body part consisting of feathers or hair about the neck of a bird or other animal

ruff (verb)	overtrump (verb)
play a trump	play a trump higher than (one previously played) to the trick