GRAMMATICAL CATEGORY OF TIGHTWIRE
Tightwire is a noun. A noun is a type of word the meaning of which determines reality.
Is tightrope one or two words?
verb (used without object), tight·roped, tight·rop·ing. to walk, move, or proceed on or as on a tightrope: He tightroped through enemy territory.
Is tightrope an adverb?
tightrope noun - Definition, pictures, pronunciation and usage notes | Oxford Advanced Learner's Dictionary at OxfordLearnersDictionaries.com.