Yes, the noun 'hike' is a common noun; a general word for a long walk or march; a general word for an abrupt increase or rise (a price hike or a pay hike).The word 'hike' is also a verb: hike, hikes, hiking, hiked.
Hike is a noun, a common noun. Hike is also a verb. Example uses:As a noun: We took a hike along the west end of the lake.As a verb: We can hike until three, then we can turn back to get in before dark.
"Park Avenue" is a proper noun, because it is a place. Proper nouns like this should always be capitalized.
proper
Hike percentage = 100*(After Hike - Before Hike)/Before Hike
Common
common and proper
common
It is a proper noun, because it is the name of a specific thing.
common
it's a common noun. a proper noun would be Spider-Man.
Pencil proper or common noun