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Oxytocin is very similar to vasopressin.
The chemical properties of calcium are most similar to (in between) the chemical properties of magnesium and strontium.
"Estrogen" is not one compound, but a group of closely related compounds. They're similar to cholesterol in that both of them contain the four-ring structure called the steroid moiety, but cholesterol has a long aliphatic chain hanging from one of the rings and most estrogens do not.
i think
Cell with similar structure and functions are grouped into tissues.
capillaries
Zinc is similar to cadmium and magnesium.
Oxytocin
Potassium - K
potatoe
the walls of lymphatic vessels are similar to those of veins
The wings.