wordStem(c("decline", "resumes", "declining"), language = "english")

[1] "declin" "resum"  "declin"

> wordStem(c("win", "winning", "winner", "fine"), language = "english")

[1] "win"    "win"    "winner" "fine"

R version 3.1.3 (2015-03-09)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 8 x64 (build 9200)

locale:
[1] LC_COLLATE=English_Singapore.1252  LC_CTYPE=English_Singapore.1252    LC_MONETARY=English_Singapore.1252 LC_NUMERIC=C
[5] LC_TIME=English_Singapore.1252

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

other attached packages:
[1] slam_0.1-32        SnowballC_0.5.1    wordcloud_2.5      RColorBrewer_1.1-2 tm_0.6             NLP_0.1-6

loaded via a namespace (and not attached):
[1] parallel_3.1.3 Rcpp_0.11.5    tools_3.1.3