A polysemous expression (mushtarak) has multiple distinct established meanings. Its use does not ordinarily demand that every meaning apply simultaneously. A selected interpretation (mu'awwal) is a preferred reading supported by contextual or juristic evidence.
The discussion of “quru'” concerns whether the relevant term denotes menstruation or periods of purity. The existence of both meanings does not entail counting both in one application. The interpreter weighs the linguistic and legal evidence.
Likewise, terms such as “mawla” require the competing meanings to be identified and then resolved by context and indications.
The distinction matters: a general word can cover multiple persons under one denotation; a polysemous word presents multiple separate meanings. These are different interpretive problems.