A two-word adjective is 'three-way', for example:
a three-way switch
a three-way mirror
a three-way bulb
a three-way phone call
Other uses for the term 'three way' are:
Three Way Restaurant, 384 E 188th Street, Bronx, NY
3 Way Lane, Three Way, TN 38343
Three Way Independent School District (TWISD), Stephenville, TX
Standard & Poor
Describing, identifying , quantifying. It describes , identifies, or quantifies a noun
It is ways
Yes, three can be used as an adjective. Example: Justin ate three cookies.
Yes. Sticklers would advocate that the adjective be hyphenated and the noun not, but I've seen the noun both ways.
three turtles swam on the pond .Find the adjective
The word 'ways' is neither. It is a noun.
Three is not an adverb. In a sentence it is a noun or an adjective.
Three.
The word ways is normally a plural noun. Colloquially it can be a noun or adjective meaning a considerable distance (a ways).
Three-part is an adjective.
An adjective must agree with the noun it modifies in gender, number, and case. In languages with gender distinctions, the adjective must match the noun's gender (masculine, feminine, or neuter). Additionally, the adjective must be in the same number (singular or plural) as the noun, and it must reflect the appropriate grammatical case, which affects its form based on the noun's role in the sentence.