The spelling of the word "Thacker" is quite straightforward using the International Phonetic Alphabet (IPA). It is spelled as /ˈθækər/ where the first sound, represented by the symbol /θ/, is a voiceless dental fricative. The second sound, represented by /æ/, is a short vowel sound pronounced with an open mouth. The last sound, represented by /kər/, is a consonantal sound pronounced with the back of the tongue touching the soft palate. Pronouncing this word using the IPA transcription will ensure accurate pronunciation.