- send someone up, send something up
- send-off
- sender
- senile dementia
- senior
- senior citizen
- seniority
- senor
- sensate
- sensation
- sensational
- sensationalise
- sensationary
- sense
- sense experience
- sense of humour
- sensible
- sensitive plant
- sensual activity
- sensualist
- sensuality
- sensualization
- sensualize
- sensuous
- sensuousness
- sentence
- sententiousness
- sequestrate
- serai
- seraphic
- serb
- serenader
- serendipity
- serene
- serge
- serial computer
- seriatim
- sericulture
- sericulturist
- series
- serif
- seriocomic
- serious
- seriously
- serjeant
- serjeant at-arms
- sermon
- seroprevalence
- serosity
- serotypes
- serpentine
- serrate thing
- serrated
- serration
- serried
- serval
- set someone back, set something back
- set someone free
- set something apart
- set something aside
- set something forth
- set something off
- set something out
- set something up
- set the pace
- set tongues wagging
- set up house
- set-up
- setback
- setter
- setter on
- settle
- settler
- settlor
- setula
- seven days
- sevenfold
- seventh
- seventhly
- seventieth
- seventy
- sever
- several
- several times
- severality
- severance of connection
- severe
- sew
- sew something up
- sewerage
- sex
- sex appeal
- sex change
- sex education
- sex hygiene
- sex kitten
- sex life
- sex maniac
- sex reversal
- sex-starved