A lyric syllable must clear a ledger line belonging to a note directly above it

When a low note requiring ledger lines sits directly above where a lyric syllable is placed, the syllable text must not overlap the ledger line stub extending down from that note.

A syllable under a very low note (several ledger lines below the staff) overlaps the bottom ledger line's stub.

Gould, Behind Bars general ledger-line and lyric placement conventions.

This rule is about where marks land on the page, so it can only be judged after engraving. Collision and spacing faults live here.