Here are the possible solutions for train sound syllable clue
Answer
Clue
Relevancy
choo
Clue
Train-sound syllable
Train sound syllable
Toy train sound
When repeated, a train sound
anapest
Clue
Three-syllable foot whose last syllable is stressed
Definition
(Greek) a type of metrical foot, also ANAPAEST
performer
Clue
Contortionist, e.g., and, read syllable by syllable, a hint to the starred answers
Definition
one who performs
huh
Clue
Answer that probably won't earn you any points on a game show unless the prompt is "This one-syllable sound usually indicates someone doesn't know what you're talking about"