The Ancient Macedonian word ἵππος
Word ἵππος
hí p p o ς
IPA híppoς
Meaning horse
See also Homeric Greek: ἵππος ‘horse’
Proto-Indo-European: *h₁ék̂wos ‘horse’

Comments
The word is not exclusively Macedonian, but is found in all Greek dialects. Discussions regarding it as a loan are pointless, since the word is part of compounds e.g. Βίλιππος/Φίλιππος.

Other words that might be of interest
ἀλίη ‘boar’, πέχαρι ‘deer’, χάρων ‘lion’, γοτάν ‘swine’, πέλλη(ς) ‘cow, oxen’