Mushtarak: separate senses conventionally assigned to the same form, exemplified by the uses of “ʿayn.”
Manqūl: a word transferred from its earlier sense into an established customary, legal or technical sense, as “ṣalāh” in religious usage.
Majāz: an associated second sense used while the literal sense remains available, as calling a brave man “a lion.”
A word's having two meanings is therefore insufficient to classify it. We must examine the nature of the assignments and the patterns of usage that connect, or do not connect, the senses.