what is difference between these word :a)answer and reply
b) bring and fetch
c) dairy and diary
d) drown and sink
e) empty and vacant
f) elder and older
g) steal and steel
h)plan, plane and plain  
i)ceiling and sealing
j) eligible and illegible
 

1) answer: a statement (either spoken or written) that is made to reply to a question or request or criticism or accusation
reply: react verbally


2) bring: take something or somebody with oneself somewhere
fetch: go or come after and bring or take back

c) diary: a daily written record of (usually personal) experiences and observations 
dairy: a farm where dairy products are produced 

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