The model airplane's propeller made a whir as it went by.
were
No, it would not be classified as onomatopeia. An Echo does not sound like it is said.
When you turn the key to start the engine will sometimes turn faster than normal and or sound like there is no compression in the cylinders . whir /whir/whir/
winter whir
whir pools lead to the 5th dimension in space. whirl pools lead to the sea floor.
No, they're homophones.
WHIR-tus.
No, but "creak" is.
burrcurfurhermirpurrsirstir
Yes it is.
Yes.