The term "lexicalized" refers to a word or phrase that has become a fixed part of a language's vocabulary, often carrying a specific meaning or connotation. Some synonyms for this term might include "entrenched," "established," "conventionalized," or "standardized." Other related words could include "idiomatic," "colloquial," or "jargon." These terms all describe aspects of language that have become ingrained within a particular community or culture, and may be unfamiliar or confusing to outsiders. Overall, the idea of lexicalization highlights the ways in which language can be deeply tied to the social and cultural contexts in which it is used.