friendship

(なかよし) A good friend.
 
(なかま) Friendship, as in “This event affected our friendship.” “Our friendship grows by the week.” HOWEVER, usually 中間 is NOT used to mean friendship, but to mean membership in a group (i.e. working for the same company, OR “The squid is the octopus’ 仲間.” “The salamander is the frog’s 仲間“)