Sometimes it's better to visualise the word than to look it up in a dictionary.
To boil To cook food in boiling water that is 100° C.
To steam To cook food by heating it in the steam made from boiling water.
To simmer To cook something slowly in hot liquid kept at or just below the boiling point (85° C/95° C).
To bake To cook in an oven witout any extra fat.
To toast To cook or brown food, like bread or cheese by exposing it on a grill or fire.
To roast To cook, especially meat, in an oven or over a fire.
To fry To cook food in hot oil, or fat.
To stir fry To fry very quickly over high heat; "stir-fry the vegetables in a wok".
To stew To cook meat and vegetables slowly in liquid an a closed dish or pan.
To Flambé To cook with alcohol which is added to a hot pan to create flames for a short time.
To BBQ To cook food over charcoals on a grill.