How Do You Spell TARTEST?
Pronunciation: [tˈɑːtəst] (IPA) 
The word "tartest" is spelled with the IPA phonetic transcription of /ˈtɑːtɪst/. This spelling is consistent with English language conventions, where the "-est" suffix is used to denote the superlative degree of adjectives. In this case, the adjective "tart" has been modified to its superlative form, hence the word "tartest". The phonetics of the word include the stressed syllable on the first "tart" with the short "a" vowel sound, followed by the unstressed "est" with the schwa sound.
