troublous/ʹtrubləs/ adj archaic or literary

• acetic acid
• acetify
• aceto-
• acetone
• acetous
• acetyl
• acetylcholine
• acetylene
• acetylsalicylic acid
• ace up one's sleeve
• Achaean
• ache
• achene
• Acheulian
• achieve
• achievement
• Achilles tendon
• Achilles’ heel
• a chip off the old block
• achlorhydria
• achondroplasia
• achromat
• achromatic
• achy
• acid