ʿArūḍ is the technical discipline of poetic metre. Metre refers to the patterned sequence of syllabic sounds, while rhyme links poetic line endings through a recognized phonetic convention.
Patterns such as fāʿilun and mafāʿīlun represent metrical arrangements rather than the lexical meanings of the words being spoken. Consequently, the presence of an attractive rhythm is not by itself proof that a passage fits a classical poetic metre.
Application: the recitation of a verse may exhibit striking sonic balance; that does not warrant forcing its words into a predetermined poetic pattern.