Synonyms for breach

Most common

1. Gap — A gap or opening made by breaking or battering, as in a wall, fortification or levee / embankment; the space…

2. Surge — A breaking of waters, as over a vessel or a coastal defence; the waters themselves

Other

nonobservance

n. 1
A gap or opening made by breaking or battering, as in a wall, fortification or levee / embankment; the space between the parts of a solid body rent by violence.
n. 2
A breaking of waters, as over a vessel or a coastal defence; the waters themselves.
A clear breach is when the waves roll over the vessel without breaking. A clean breach is when everything on deck is swept away.
v. 1
To make a breach in.
They breached the outer wall, but not the main one.

Plural: breaches → gaps, breaks, ruptures, violations…
Past participle: breached
e.g. breached → violated, contravened, transgressed, offended…

Use in printed books, per decade from 1850 to 2019.

3 letters: gap¹
4 letters: surf¹, rift¹, flaw¹
5 letters: break¹, burst¹, surge¹, chasm²
6 letters: offend²
7 letters: opening³, violate³, rupture², fissure², infract
8 letters: division³, breaking², fracture², trespass², disunion³
9 letters: violation⁴
10 letters: difference³, separation⁴, disruption³, infraction³, contravene³, transgress²
12 letters: infringement³
13 letters: transgression³, nonobservance

The small number after each word is its number of syllables (chasm² = 2 syllables).