Usually, no specific medical treatment is needed if a virus is causing the sore throat. The throat most often gets better on its own within five to seven days. Antibiotic medicine does not cure viral pharyngitis. For acute pharyngitis caused by bacteria, your health-care provider may prescribe an antibiotic.
The definition of attainment is an act of achieving or getting something or something that is achieved or acquired. Working on a Ph.D. is an example of an attainment.
They're synonyms. Gain is the most general. Attain usually means to reach a goal or milestone (he attained the rank of captain). Obtain usually implies careful planning or some effort to get to the thing or goal. But they have probably something like 80% overlap in meaning.