Please help me by suggestion

dictonary oxford will be best

OXord Illustrated Dictionary and The New Oxford Thesaurus of English

Dictionary -Collins Co Build

Thesauras-no idea  check up with land mark 

If you are looking for offline dictionary for your PC, then you can download WordWeb from net.

Hi,

 agreed with Krishna 

you can dowload from the

https://wordweb.info/free/