The word "a-s" is typically spelled with two letters, "a" and "s". The "a" is pronounced as the short vowel sound /æ/ and the "s" is pronounced as the voiceless alveolar fricative /s/. The word is often used as a slang or informal way of saying "ass", which refers to the buttocks or rear end of a person or animal. It is important to note that this word can be considered vulgar or offensive in certain contexts, and should be used with caution.