Parsing the Book’s Example “Maṣābīḥ”

Diptote Causes — Ultimate Broken-Plural Patterns

كَمَصَابِيحَ — such as maṣābīḥ.
كَـ: preposition of comparison.
مَصَابِيحَ: noun in the genitive after kāf, with fatḥa because it is a diptote.

Here كَـ introduces an example semantically, but also governs genitive case syntactically; the visible fatḥa marks that genitive.