Amuse means to entertain.
Armed forces vs Armored forces
armed forces—the military forces of a country including the army, navy, air force, etc.:
Art vs Science
Art and Science designate a branch of learning.
Art vs Skill vs Cunning vs Artifice vs Craft
Art, Skill, Cunning, Artifice and Craft can mean the faculty of performing or executing expertly what is planned or devised.
Ample vs Enough
Ample means more than adequate in capacity, scope, or size.
Armchair general vs Armchair pilot
armchair general—smb. who speaks critically of military matters, etc. but has no real experience:
Arm in arm vs Hand in hand
arm in arm—with one’s arm under or around another person’s arm:
Arrogate vs Usurp vs Preempt vs Appropriate vs Confiscate
Arrogate, Usurp, Preempt, Appropriate and Confiscate all mean to seize or assume something by more or less high-handed methods.
Amount vs Number
Amount refers to things that cannot be counted individually.
Amoral vs Immoral
Immoral means contrary to established moral standards.
Arrival and Advent
Arrival and Advent denote in common the reaching of a destination.
Archaic word vs Archaistic word
archaic word—a word that is no longer in general use but is still encountered in literature and sometimes used for special effect: