The term BE HUMAN can be broken down into three words: ERR (3 letters), ERRS (4 letters), and ERRED (5 letters). ERR is a verb meaning to make a mistake or do something wrong. ERRS is the third-person singular present tense of the verb, meaning 'he, she, or it ERRS'. ERRED is the past tense of the verb, meaning 'he, she, or it ERRED'. All three words are related to the concept of making mistakes, which is an important part of being human.