To cite package ‘syn’ in publications use:

  Tierney N, Stringer A, Cheng M, de Jong L (2024). _syn: Creates
  Synonyms From Target Words_. R package version 0.1.1, ,
  <https://github.com/njtierney/syn>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {syn: Creates Synonyms From Target Words},
    author = {Nicholas Tierney and Amy Stringer and Mike Cheng and Laura {de Jong}},
    year = {2024},
    note = {R package version 0.1.1, },
    url = {https://github.com/njtierney/syn},
  }