a -= without

(1)abyss

assonance：boss

meaning：a bottomless depth

example：a rope led down into the dark abyss.

(2)achromatic

assonance：crown

meaning：uncolored

example：the achromatic gloom

(3)amnesty

assonance：nest

meaning：release from punishment

example：an amnesty for political prisoners

(4)amnesia

assonance：asia

meaning：a partial or total loss of memory

example：amnesia and memory loss.

(5)amoral

assonance：moral

meaning：without moral standards or principles

example：a completely amoral person.

(6)apathy

assonance：path

meaning：indifference

example：she heard the story with apathy.

(7)aphasia

assonance：fan

meaning：inability to understand or produce speech

example：aphasia is a disorder caused by damage to

                 the parts of the brain that control language  

(8)asylum

assonance：silence

meaning：shelter or protection from danger

example：the abandoned children were put into an asylum.

(9)asymmetry

assonance：sympathy

meaning：lack of balance

example：breast asymmetry could be a predictor of breast cancer.

(10)atheism

assonance：theme

meaning：disbelief in the existence of god or gods. 

example ：atheism is often wrongly confounded.

(11)atom

assonance：ten

meaning：an extremely small amount of something 

example：he couldn't   produce an atom of evidence.

(12)atypical

assonance：type 

meaning：not conforming to type; unusual or irregular. 

example：atypical behavior.