German · Pronunciation Guide
dair KOPF. The pf at the end is a single affricate — p and f produced in one continuous motion.
Nothing to choose between syllables here, so the interest is in the consonant cluster that closes the word. The plural Köpfe fronts the vowel to a short ö and adds a schwa, and having a vowel after the pf makes the affricate considerably easier to produce.
Listen: der Kopf
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Mein Kopf tut weh.
My head hurts.
Listen: Mein Kopf tut weh.
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Mein Kopf tut weh uses the fixed expression wehtun, which German writes as one verb but splits in a sentence. Weh has a long 'ay' with a silent h, so the sentence closes on an open held vowel after the clipped cluster of the noun.
English has no pf at the end of a word, so speakers drop one half or the other and produce 'kop' or 'kof'. Both parts must be there and they must be continuous — close for the p, then release into the f rather than pausing between them. Practise it in the plural first, where the following vowel gives the cluster somewhere to go.