numskull or numbskull/ʹnumskul/ noun

• agribusiness
• agriculture
• agrimony
• agro-
• agrobiology
• agrochemical
• agroforestry
• agronomy
• aground
• ague
• AH
• ah
• AHA
• aha
• ahead
• ahead of
• ahead of the game
• ahem
• ahimsa
• ahistorical
• -aholic
• a home from home
• a horse of another/a different colour
• ahoy
• a hundred to one