If you are lucky you have good luck or are fortunate (e.g. you win the lottery). If you are happy, you are not sad.

When you learn you receive information. When you teach you give information out to someone else.

A cushion is quite colourful and normally found on armchairs, sofas, etc. A pillow is normally found on a bed.

If something is fun it is pleasant or enjoyable. If something is funny, it makes you laugh.

To take an exam means to physically do the exam. At this stage you don't know if you have passed or failed. To pass an exam means that you are successful.

When you blink, you close then open both eyes - often mechanically. When you wink you deliberately close then open just one eye.

If something fits it is the right size. If something suits you it looks good on you.

A foreigner is someone from a different country to your own. A stranger is any person you don't know.

To discover something is to find something that already exists but was not known before To invent something is to make or produce something for the first time

Economic is an adjective which means 'to do with the economy'. If something is economical it saves you money in some way by using less energy, petrol, etc.

If you lose something, you can't find it. Loose is the opposite of 'tight

Quite means 'rather'. Quiet means `not noisy'.