Words that are short for something else.
Abbreviations
Bayerische Motoren Werke AG, shortened to BMW, is a German car maker that also make motorbikes and engines.
A bug is a slang word for any insect or anything that is like an insect, for example a spider.
You might also use bug as another word for annoy, as in "stop bugging me".
A bug is also a covert listening device, used to spy on what other people are talking about.
Phone is an abbreviation for telephone, either a fixed phone or a cellphone.
A prom, or formal, is a formal attire dance usually held by a school or college at the end of the academic year.
Prom is short for promenade.
Puss is a short word for pussycat. People often use it as a name for a cat, or to call a cat.
Xmas is an abbreviated form of Christmas.