Intrauterine device and Rhythm method

Intrauterine device noun - Contraceptive device consisting of a piece of bent plastic or metal that is inserted through the vagina into the uterus.

Rhythm method and intrauterine device are semantically related In some cases you can use "Rhythm method" instead a noun phrase "Intrauterine device".

Rhythm method noun - Natural family planning in which ovulation is assumed to occur 14 days before the onset of a period (the fertile period would be assumed to extend from day 10 through day 18 of her cycle).

Intrauterine device and rhythm method are semantically related in birth control method topic. You can use "Intrauterine device" instead a noun phrase "Rhythm method".