4 words for TTX 1–3 letters

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1 letter (2)

t x
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2 letters (1)

tt
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3 letters (1)

txt
Hippy musical
?
H
?
A
?
I
?
R
Hint 1 meaning
A slender outgrowth from the chitinous cuticle of insects, spiders, crustaceans, and other invertebrates. Such hairs are totally unlike those of vertebrates in structure, composition, and mode of growth.
Hint 2 anagram
ARHI
Hint 3 another clue
Coat
19 +2