At intervals, (every) now and then/again, and (every) once in a while are all synonyms for sometimes. Always and never are antonyms of sometimes. And here are 23 another word for sometimes.
(every) now and then/again, (every) once in a while, at intervals, at times, discontinuously, erratically, every so often, fitfully, from time to time, in/by fits and starts, intermittently, irregularly, occasionally, off and on, on occasion, on occasions, on the odd occasion, periodically, piecemeal, spasmodically, sporadically, and interruptedly are all synonyms for sometimes.
Sometimes synonym page has a variety of synonyms that differ in length. 1 synonym with 7, 9, 10, 13, 15, 16, and 20 letters and 2 synonyms with 8, 14, and 17 letters. 4 synonyms with 11, and 12 letters. For a total of 21 another word for sometimes.
Sometimes I prefer staying indoors.
We go hiking sometimes on weekends.
He sometimes forgets to call me.
She feels tired sometimes after work.