Northrop Northrop /ˈnɔrθrəp/

noun

1. United States biochemist (1891-1987)  ( John Howard Northrop , Northrop )
   United States biochemist (1891-1987)
   
   

 dong dong /ˈdɔŋg/

noun

1. The basic unit of money in Vietnam  ( dong )
   the basic unit of money in Vietnam
    In Vietnam, I bought a meal for 50,000 dong.
   In Vietnam, I bought a meal for 50,000 dong.
   
   

verb

1. Go 'ding dong', like a bell  ( ding , dingdong , dong )
   go 'ding dong', like a bell
   

 headache headache /ˈhɛˌdeɪk/

noun

1. () Something or someone that causes anxiety; a source of unhappiness  ( vexation , concern , headache , worry )
   something or someone that causes anxiety; a source of unhappiness
    New York traffic is a constant concern
   New York traffic is a constant concern
    It's a major worry
   it's a major worry
   
2. () Pain in the head caused by dilation of cerebral arteries or muscle contractions or a reaction to drugs  ( cephalalgia , head ache , headache )
   pain in the head caused by dilation of cerebral arteries or muscle contractions or a reaction to drugs
    I have a headache and need to take some painkillers
   I have a headache and need to take some painkillers
   
   

 auction sale auction sale /ˈɔːkʃən seɪl/

noun

1. The public sale of something to the highest bidder  ( auction , auction sale , vendue [American] )
   the public sale of something to the highest bidder