Word form, also known as morphology, refers to the structure and arrangement of words. There are different types of word forms such as nouns, verbs, adjectives, adverbs, and pronouns. Synonyms for word form could include the term "morphology" or "word structure". Another option is "lexical form", which refers to the base form of a word before any inflections or changes have been made. Other synonyms could include "grammatical form", "part of speech", and "word class". Understanding the different word forms is important for effective communication in both written and spoken language.