The spelling of "heather heart" can be explained using the International Phonetic Alphabet (IPA). "Heather" is pronounced with the /h/ sound at the beginning, followed by an /ɛ/ sound, and then a /ð/ sound. The second syllable is pronounced with a short /ə/ sound and the "th" sound /θ/. "Heart" has the /h/ sound at the beginning, followed by a long /ɑ/ sound and a /r/ sound at the end. Together, "heather heart" is pronounced as /ˈhɛðər hɑrt/ in IPA.