Written words which have the same spelling but different pronunciations e.g. 'lead' can mean either a metal or the present tense of a verb with the past tense 'led', and in each case the pronuncation is different. See also Homophone
In SYSTRAN terminology, one of two or more words that have the same spelling and are different parts of speech (for example, noun and verb, or adjective and verb). For example, head as in head west or on the head, and light, as in the light box and light the match.
One of two or more linguistic forms that are spelled alike, but different in function or meaning or in pronunciation. Example: bank 'river bank' and bank 'financial institution' (different meaning) read (infinitive) and read (participle) (different pronunciation)