The word "irrumate" is a relatively uncommon term, with limited synonyms in the English language. It refers to the act of orally penetrating someone with a male genital organ. A few synonyms for "irrumate" are "fellate," "suck off," "give head," "blowjob," and "oral sex." However, it is important to note that using euphemistic synonyms for sexual acts can be a source of discomfort for some people. It is always essential to communicate with your partner and use language that makes both of you comfortable. Additionally, using medically accurate terminology can also help in avoiding any possible ambiguity or misunderstandings in sexual communication.