sacrifice - v. to do without something or to suffer a loss for a belief, idea, goal or another person

sad - ad. not happy safe - ad. away from harm or danger

sail - v. to travel by boat or ship

sailor - n. a person involved in sailing a boat or ship

salt - n. a white substance found in sea water and in the ground, used to affect the taste of food

same - ad. not different; not changed; like another or others

sand - n. extremely small pieces of crushed¹ rock found in large amounts in deserts and on coasts

satellite - n. a small object in space that moves around a larger object; an object placed in orbit² around the earth

satisfy - v. to give or provide what is desired, needed or demanded

save - v. to make safe; to remove from harm; to keep for future use

say - v. to speak; to express in words

school - n. a place for education; a place where people go to learn

science - n. the study of nature and the actions of natural things, and the knowledge gained about them

sea - n. a large area of salt water, usually part of an ocean

search - v. to look for carefully

season - n. one of the four periods of the year that is based on the earth's position toward³ the sun (spring, summer, autumn, winter); a period of time based on different weather conditions ("dry season", "rainy season"); a period during the year when something usually happens ("baseball season")

seat - n. a thing to sit on; a place to sit or the right to sit there ("a seat in parliament")

second - ad. the one that comes after the first

secret - n. something known only to a few and kept from general knowledge; ad. hidden from others; known only to a few

security⁴ - n. freedom from danger or harm; protection; measures necessary to protect a person or place ("Security was increased in the city.")

see - v. to know or sense through the eyes; to understand or know

seed - n. the part of a plant from which new plants grow

seek(ing) - v. to search for ("They are seeking a cure for cancer."); to try to get ("She is seeking election⁵ to public office."); to plan to do ("Electric power companies are seeking to reduce their use of coal.")

seem - v. to appear to be ("She seems to be in good health.")

seize - v. to take quickly by force; to take control of quickly; to arrest

self - n. all that which makes one person different from others

sell - v. to give something in exchange for money

Senate⁶ - n. the smaller of the two groups in the governments of some countries, such as in the United States Congress⁷

send - v. to cause to go; to permit to go; to cause to be carried, taken or directed to or away from a place

sense - v. to come to know about by feeling, believing or understanding; n. any of the abilities to see, hear, taste, smell or feel

sentence - v. to declare the punishment for a crime; n. the punishment for a crime

separate - v. to set or keep people, things or ideas away from or independent from others; ad. not together or connected; different