Formal terms:
* Rhythm: This is the most general term and encompasses the overall pattern of stressed and unstressed syllables.
* Meter: This refers to the specific pattern of stressed and unstressed syllables within a line of poetry.
* Ictus: This is a more technical term for the stressed syllable in a foot of poetry.
* Accent: This is a more general term for emphasis on a syllable, but can also be used in poetry.
Informal terms:
* Emphasis: This highlights the importance of the stressed syllable in creating the rhythm.
* Beat: This emphasizes the rhythmic effect of the stressed syllable.
* Pulse: This evokes the sense of movement and energy created by the stressed syllables.
The best synonym for "metrical stress" depends on the specific context and the desired level of formality.