The word might also have been used for a receptacle near the guns where powder and balls were kept.
( ( The word ) ( ( ( might also ) ( have ( been ( ( used ( for ( ( a receptacle ) ( near ( the guns ) ) ) ) ) ( where ( ( ( powder and ) balls ) ( were kept ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN word)) (VP (MD might) (ADVP (RB also)) (VP (VB have) (VP (VBN been) (VP (VBN used) (PP (IN for) (NP (NP (DT a) (NN receptacle)) (PP (IN near) (NP (DT the) (NNS guns))))) (SBAR (WHADVP (WRB where)) (S (NP (NN powder) (CC and) (NNS balls)) (VP (VBD were) (VP (VBN kept))))))))) (. .)))
The word may have been used to show where the powder and balls for guns were kept. 
( ( The word ) ( ( may ( have ( been ( used ( to ( show ( where ( ( ( the ( ( powder and ) balls ) ) ( for guns ) ) ( were kept ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN word)) (VP (MD may) (VP (VB have) (VP (VBN been) (VP (VBN used) (S (VP (TO to) (VP (VB show) (SBAR (WHADVP (WRB where)) (S (NP (NP (DT the) (NN powder) (CC and) (NNS balls)) (PP (IN for) (NP (NNS guns)))) (VP (VBD were) (VP (VBN kept)))))))))))) (. .)))