pony-trekking vs riding

pony-trekking and riding both are nouns.

Word	Noun	Adjective	Verb	Adverb
pony-trekking	Yes	No	No	No
riding	Yes	No	No	No

As nouns, riding is a hypernym of pony-trekking; that is, riding is a word with a broader meaning than pony-trekking:

pony-trekking: a sport in which people ride across country on ponies
riding: the sport of sitting on the back of a horse while controlling its movements

Other hypernyms of pony-trekking include equitation, horseback riding.

pony-trekking (noun)	riding (noun)
a sport in which people ride across country on ponies	travel by being carried on horseback
	the sport of sitting on the back of a horse while controlling its movements