pistol

pistol /ˈpɪstl̟/ noun
plural pistols
pistol
/ˈpɪstl̟/
noun
plural pistols
Britannica Dictionary definition of PISTOL
[count]
1 
: a small gun made to be aimed and fired with one hand — see picture at gun; see also water pistol
2 
US, informal : a person who has a lot of energy and spirit — usually singular