Day 19 list(frequency 4)

 
1 rigorous     be rigorous with   rigorous search  rigorous discipline  a rigorous climate

2 ritual ritualistic ritualize
3 roam wander stroll
4 routine 
5 sail sailing sailor cruise journey navigate
6 sheer pure entire steep
7 shelf
8 silent silence silencer placid tranquil tacit
9 soccer football
10 specify specific specification specificallyarticulate clarify delineate
11 split bisect cleave crack hack server
12 sponsor sponsorship
13 spouse
14 spray sprayer  spray gun shower sprinkle spatter splash
15 starve starvation starveling hungerfamish thirst  thirsty hungry

16 stimulate stimulation stimulating stimulus/stimuli  stimulant
17 stomach
18 strip stripper
19 suffrage suffragette
20 superior superiority inferior inferiority
 
 
1 surge wave billow gush
2 sustain sustainable sustenance
3 tackle undertake deal with , cope with, handle
4 tap knock pat touch strike
5 topsoil subsoil
6 toxin toxic
7 treadmill child-rearing
8 underlying implicit latent imply/implied
9 unprecedented
10 utterance  utter
11 vacuum
12 viable viability
13 vicinity
14 vicious
15 voucher
16 weigh weight
17 wise wisely wisdom
18 witness