We always have troubles to learn the correct words that's why I'll write down a list of them.
Noun Adjective Verb Adverb
sadness sad sadden sadly
tristeza triste entristecer tristemente
sadist sadistic --- ---
sádico sádico
sadism --- --- ---
sadismo
safety safe secure safely
seguridad seguro asegurar con seguridad
sand sandy sand down ---
arena arenoso lijar, pulir
satisfaction satisfactory satisfy satisfactorily
satisfacción satisfactorio satisfacer satisfactoriamente
--- satisfied --- ---
satisfecho
saving --- save ---
ahorro ahorrar
searcher --- search ---
buscador buscar
--- snug snuggler ---
cómodo y calientito acomodarse
soap soapy soap ---
jabón jabonoso enjabonar
sculpture --- sculpt ---
escultura esculpir
sculptress --- --- ---
escultora
sculptor --- --- ---
escultor
surface superficial surface superficially
superficie superficial emerger superficialmente
superficialty --- --- ---
superficialidad