The word "screwtap" is spelled as [skruːtæp] in IPA phonetic transcription. It is composed of two syllables, with the stress on the first syllable. The "screw" part of the word represents the sound "skruː," which is similar to the word "screw." The "tap" part of the word represents the sound "tæp," which is similar to the word "tap." Overall, the word "screwtap" is spelled according to its phonetic sounds, representing the combination of two common English words.