Onomatopoeia is a literary device in which words are used to imitate the sounds they represent. The two crossword solutions for this term, IMITATIVE and ECHOIC, both refer to the idea of imitating sounds. IMITATIVE is a nine-letter word that means to imitate or copy, while ECHOIC is a six-letter word that means to repeat or echo a sound. Both words are related to onomatopoeia, as they refer to the idea of imitating or echoing sounds.