hike up vs hike

hike up is not a noun while hike is a noun.

Word	Noun	Adjective	Verb	Adverb
hike up	No	No	Yes	No
hike	Yes	No	Yes	No

As verbs, hike up and hike are synonyms defined as:

Other synonyms of hike up include boost.

hike up (noun)	hike (noun)
	a long walk usually for exercise or pleasure
	the amount a salary is increased
	an increase in cost

hike up (verb)	hike (verb)
pull up	walk a long way, as for pleasure or physical exercise
increase	increase