The spelling of the word "take board" can be explained using the International Phonetic Alphabet (IPA). The first syllable /teɪk/ is spelled with the letter "t" followed by the diphthong "ay" /eɪ/ represented by the letter "a". The second syllable /bɔːrd/ is spelled with the letters "b", "o", and "r" representing the vowel sound /ɔː/ and the letter "d" at the end. Overall, the spelling of "take board" uses the letters to represent the sounds of the spoken word using the IPA.