1-hitter vs one-hitter

1-hitter and one-hitter both are nouns.

Word	Noun	Adjective	Verb	Adverb
1-hitter	Yes	No	No	No
one-hitter	Yes	No	No	No

As nouns, 1-hitter and one-hitter are synonyms defined as:

1-hitter and one-hitter: a game in which a pitcher allows the opposing team only one hit

1-hitter (noun)	one-hitter (noun)
a game in which a pitcher allows the opposing team only one hit	a game in which a pitcher allows the opposing team only one hit