ח different from Heth
Heth, sometimes written Chet, but more accurately Ḥet, is the eighth letter of the Semitic abjads, including Phoenician ḥēt 𐤇 , Hebrew ḥēt ח‎, Aramaic ḥēṯ , Syriac ḥēṯ ܚ, and Arabic ḥāʾ ح.
Heth originally represented a voiceless fricative, either pharyngeal /ħ/, or  velar /x/. In Arabic, two corresponding letters were created for both phonemic sounds: unmodified ḥāʾ ح represents /ħ/, while ḫāʾ خ represents /x/.
The Phoenician letter gave rise to the Greek eta Η, Etruscan , Latin H, and Cyrillic И. While H is a consonant in the Latin alphabet, the Greek and Cyrillic equivalents represent vowel sounds, though the letter was originally a consonant in Greek and this usage later evolved into the rough breathing character.Arabic ḥāʾ
The letter is named حَاءْ ḥāʾ and is the sixth letter of the alphabet. Its shape varies depending on its position in the word:Pronunciation
In Arabic, ḥāʾ is similar to the English [h], but it is much "raspier", IPA: [ħ]~[ʜ]. (Pharyngeal H)
In Persian, it is [h], like ⟨ه⟩ and the English h.Hebrew Chet
Hebrew spelling: חֵית‎Pronunciation
In Modern Israeli Hebrew (and Ashkenazi Hebrew, although not under strict pronunciation), the letter Ḥet (חֵית‎) usually has the sound value of a voiceless uvular fricative (/χ/), as the historical phonemes of the letters Ḥet ח (/ħ/) and Khaf כ (/x/) merged, both becoming the voiceless uvular fricative (/χ/). In more rare Ashkenazi phonologies, it is pronounced as a voiceless pharyngeal fricative (/ħ/).
The (/ħ/) pronunciation is still common among Israeli Arabs and Mizrahi Jews (particularly among the older generation and popular Mizrahi singers, especially Yemenites), in accordance with oriental Jewish traditions (see, e.g., Mizrahi Hebrew and Yemenite Hebrew).
The ability to pronounce the Arabic letter ḥāʾ (ح) correctly as a voiceless pharyngeal fricative /ħ/ is often used as a shibboleth to distinguish Arabic-speakers from non-Arabic-speakers; in particular, pronunciation of the letter as /x/ is seen as a hallmark of Ashkenazi and Greek Jews.Ḥet is one of the few Hebrew consonants that can take a vowel at the end of a word. This occurs when patach gnuva comes under the Ḥet at the end of the word. The combination is then pronounced /-aħ/ rather than /-ħa/. For example: פָּתוּחַ (/ˌpaˈtuaħ/), and תַּפּוּחַ (/ˌtaˈpuaħ/).