What do I call the double word nouns such as pom-pom, ack-ack, muu-muu? Where can I find the whole list?
Thanks, Ah Mar
An interesting question. Matching pairs of syllables are rare and I don't think we have a category name for them. Another example is dum dum, as in bullets. Dum Dum is a suburb of Calcutta where the soft-nosed bullets that break apart upon impact with a human body, thus causing greater internal trauma, were first manufactured. The only other example I can think of is tom-tom, an American Indian drum, and I have no idea of its etymology.
Ack-ack is onomatopoeic but your other two are not.
Almost matching pairs like sing-song, riffraff and fiddle-faddle are much more common, and there is a linguistic rule that determines which must come first in such pairs.