The phrase "for short" can be replaced with a number of different words and expressions depending on the context. Common alternatives include "abbreviated as," "known as," "referred to as," "nicknamed," "called," "shortened to," "reduced to," and "simplified as." These options all indicate that a longer or more formal term is being replaced by a more casual or abbreviated form. Other possible synonyms for "for short" may depend on the specific word or phrase being shortened, such as "AKA" for "also known as" or "comp." for "company." Ultimately, the choice of synonym will depend on the intended tone and purpose of the writing or conversation.