What rhymes with later - 1 syllable
 cater
 crater
 frater
 freighter
 gaiter
 gator
 grater
 greater
 hater
 mater
 pater
 plater
 prater
 rater
 skater
 stater
 straighter
 traitor
 waiter

What rhymes with later - 2 syllables
 creator
 curator
 debater
 deflator
 dictator
 equator
 inflator
 translator
 viator

What rhymes with later - 3 syllables
 ordinator
 vindicator