Pyjama suit and Pj's

Pj's and pyjama suit are semantically related. In some cases you can replace term "Pj's" with "Pyjama suit", this terms are similar. colloquial substitute

Pj's noun - (usually plural) loose-fitting nightclothes worn for sleeping or lounging; have a jacket top and trousers.

Pyjama suit and pj's are semantically related. Sometimes you can replace phrase "Pyjama suit" with "Pj's", this terms are similar.