screaky, screechy, squeaking, squeaky, squealing
Webster's Dictionary (GCIDE)
high-pitched \high-pitched\ adj.
1.high in pitch or frequency; -- used of sounds and voices. Opposite of low. [Narrower terms: adenoidal, pinched, nasal; altissimo; alto; countertenor, alto; falsetto; peaky, spiky; piping; shrill, sharp; screaky, screechy, squeaking, squeaky, squealing; soprano, treble; sopranino; tenor]
Syn: high. [WordNet 1.5]
2.set at a sharp or high angle or slant; as, a high-pitched roof.
Syn: steeply pitched, steep. [WordNet 1.5] high-power