Medical

You use your ears to hear with. Hearing is a very important sense but it is possible to live very well when you cannot hear. Someone who cannot hear is deaf. Some people who are deaf never learn to talk so they communicate with sign language.

Hemlock is also known as Devil's porridge, beaver Poison, musquash root, cowbane or poison parsley. Hemlock is a very poisonous plant that has been used for centuries for assassinations and executions. It is extremely toxic to humans and animals, and eating any amount can cause death. It is most toxic when it is fresh.

Your hip is the part below your waist on the sides of your body where your leg joins your body. People's hips are typically wider than their waists, particularly on women.
The woman in the picture has one hand on her hip.

While people have toes on the end of their feet and cats and dogs have paws with claws, animals like cows and horses have hooves.
A hoof is just the tip of the animal's toe, encased in a hard substance made out of the same stuff as our fingernails are made from. Hooves continue to grow just like our fingernails, and are worn down by the animal walking around. If the animal like a horse walks around on very hard ground like a road their hoof will wear down too fast, so people make them special shoes to protect their hooves.
The hoof in the picture is a cow's hoof. Cows have cloven feet, meaning the hoof is divided into two sections.

A hospital is a big place where sick and injured people are taken to get better. Babies are also born in hospitals. Doctors and nurses work together to make people better in hospitals.

A hump is a large lump on the back of an animal or a person. On people, a hump is usually caused by your spine curving from old age. With animals like the camel in the picture, the hump is mostly fat, and it stores food.

Ill is another word for sick, as in "I feel ill today". It may also be used before another word to make a negative phrase out of that word, for example "the child was very ill mannered" , or "she received nothing but ill will".

When you give someone an injection you use a syringe to put some liquid into them through a small needle.

The person in the picture is being vaccinated.

If you have insomnia, you have trouble sleeping, which means you are tired during the day. Someone who has insomnia is called an insomniac. Insomniacs might have trouble falling asleep, staying asleep, or both.
Many medications have insomnia as a side effect.

The iris is the colored part of your eye. The iris is a muscle that opens and closes the pupil in the center of your eye, controlling how much light reaches the inside of your eye.