shibboleth /shibˈə-leth/

1. The criterion, catchword or catchphrase of a group, party or sect by which members may be identified
2. A slogan
3. A peculiarity of speech
4. The Gileadite test-word to distinguish an Ephraimite, who could not pronounce sh (from Bible, Judges 12.5–6)
5. Any such test

• Sabbath
• Sabbath-breaker
• Sabbath-breaking
• Sabbath-day
• Sabbath-day's journey
• Sabbathless
• Sabbaths
• Sabbath school
• Sabbath schools
• sabbatic
• sabbatical
• sabbaticals
• sabbatical year
• sabbatical years
• sabbatine
• session
• sessional
• sessionally
• session-clerk
• session-clerks
• session-house
• session-houses
• session musician
• sessions
• session singer