straitlaced or straightlacedadj

• archimandrite
• Archimedes’ principle
• Archimedes’ screw
• archipelago
• architect
• architectonic
• architectonics
• architectural
• architecture
• architrave
• archive
• archivist
• archivolt
• archlute
• archon
• archosaur
• archpriest
• archway
• -archy
• arc lamp
• Arctic
• Arctic Circle
• arctic fox
• arctic hare
• arctophile