As a noun, two words. As a verb, hyphenated.
Q: Where does he go every weekend?
A: He jet-skis on his jet ski.
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No, the plural form skis is a regular plural for the singular noun ski. A regular plural is a noun to which an -s or an -es is added to form the plural. An irregular plural is plurals formed in some other way.
no it is not an one word it is of two word
I think the word "ongoing" is only one word, but it has two syllables that are two separate words.
It is one word.
one word