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A sickle is a cutting tool with a curved blade that used to be used to harvest grain by hand. Sickles are still used in some developing countries but in developed countries they have been largely superseded by mechanical harvesters.
A sifter is a device designed to get any lumps out of powders like flour for cooking, or to mix different powders together. A sifter is very similar to a sieve but it has a handle on the side that turns some blades inside the sifter around to make the process of sifting the powders faster and easier.
A sign is something that conveys some kind of meaning. Signs might be made up of pictures, words, or a combination of both. Many signs are just symbols, so that people will recognize what they mean no matter what language they speak. Signs don't need to be painted on a board - for example, deaf people communicate with sign language, using their hands to make symbols.
Silence is the state of there being no noise. When it is very quiet you might say there is silence.
You may also use silence in terms of nobody talking about something for some time. For example "The celebrity is back in the media after a time of silence".
You may also use silence in terms of nobody talking about something for some time. For example "The celebrity is back in the media after a time of silence".
Silkworms are caterpillars that grow up into silkmoths. They live almost entirely on mulberry leaves. The cocoon they make can be used to make silk, a very attractive cloth that has been valued for thousands of years. A silkworm cocoon is made from a single strand of silk 1000 to 3000 feet long, and it takes 2000-3000 cocoons to make a pound of silk. The caterpillar in the cocoon is not allowed to emerge by itself, as this would damage the silk. The cocoons are boiled with the caterpillar inside.