ramp vs ski jump

ramp and ski jump both are nouns.

Word	Noun	Adjective	Verb	Adverb
ramp	Yes	No	Yes	No
ski jump	Yes	No	Yes	No

As nouns, ski jump is a hyponym of ramp; that is, ski jump is a word with a more specific, narrower meaning than ramp:

ramp (noun)	ski jump (noun)
an inclined surface connecting two levels	a steep downward ramp from which skiers jump
a movable staircase that passengers use to board or leave an aircraft
North American perennial having a slender bulb and whitish flowers

ramp (verb)	ski jump (verb)
stand with arms or forelegs raised, as if menacing	jump on skis
creep up -- used especially of plants
be rampant
furnish with a ramp
behave violently, as if in state of a great anger