| now and then(expression, idiom, adverb, time, moment) |
| occasionally(expression, adverb, time, moment, rare) |
| on occasion(expression, adverb, time, moment, rare) |
| sometimes(expression, adverb, time, moment, rare) |
| every once in a while(expression, idiom, time, moment, regular) |
| once in a while(expression, adverb, time, moment, rare) |
| at times(expression, adverb, time, moment, rare) |
| now and again(expression, adverb, time, moment, rare) |
| off and on(expression, idiom, adverb, time, moment) |
| every now and then(expression, adverb, time, moment, rare) |
| at intervals(expression, adverb, time, rare, vacillating) |
| betweentimes(expression, time, moment, rare, frequency) |
| frequently(adverb, throughout, occasionally, passim) |
| intermittently(expression, adverb, time, rare, vacillating) |
| once again |
| ever and again(expression, adverb, time, moment, rare) |
| on and off(expression, adverb, time, moment, rare) |
| time |
| here and there(expression, adjective, idiom, adverb, time) |
| periodic(expression, adjective, time, regular, rare) |