pow pow /ˈpaʊ/

interjection

1. () The sound of an impact (such as a punch) or an explosion  ( pow )
   the sound of an impact (such as a punch) or an explosion
   

 POW

noun

1. () A person who surrenders to (or is taken by) the enemy in time of war  ( POW , prisoner of war )
   a person who surrenders to (or is taken by) the enemy in time of war
    After the battle, they took him as a prisoner of war, hoping for an exchange.
   After the battle, they took him as a prisoner of war, hoping for an exchange.
   
   

 subtracter subtracter /səbˈtræktər/

noun

1. A machine that subtracts numbers  ( subtracter )
   a machine that subtracts numbers
    For this math operation, the machine uses a subtracter to get the result.
   For this math operation, the machine uses a subtracter to get the result.
   
   
2. A person who subtracts numbers  ( subtracter )
   a person who subtracts numbers
   

 laboratory laboratory /ˈlæbrəˌtɔri/

noun

1. () A workplace for the conduct of scientific research  ( research lab , research laboratory , science lab , lab , laboratory , science laboratory )
   a workplace for the conduct of scientific research
    The students conducted their experiment in the laboratory
   The students conducted their experiment in the laboratory
   
   
2. A region resembling a laboratory inasmuch as it offers opportunities for observation and practice and experimentation  ( laboratory , testing ground )
   a region resembling a laboratory inasmuch as it offers opportunities for observation and practice and experimentation
    The new nation is a testing ground for socioeconomic theories
   the new nation is a testing ground for socioeconomic theories
    Pakistan is a laboratory for studying the use of American troops to combat terrorism
   Pakistan is a laboratory for studying the use of American troops to combat terrorism
   
   

 catechist catechist /ˈkætəkɪst/

noun

1. One who instructs catechumens in preparation for baptism (especially one using a catechism)  ( catechist )
   one who instructs catechumens in preparation for baptism (especially one using a catechism)
    The local catechist spent Sundays preparing the youth for their upcoming baptism.
   The local catechist spent Sundays preparing the youth for their upcoming baptism.