What is common to onion and lily?

Question

the answer should be in 1 sentence or just one word.it is a science question.

Answer 1

they are both bulbs

Answer 2

Both are from Liliaceae family with underground bulbs having discoid stem, long slender aerial leaves.

Answer 3

its oily and good for health

Answer 4

They are biennial, members of liliacae family& having bulb by which they can be  propogated.

Answer 5

Surprisingly.....alovera

Answer 6

The bulbous onion and its numerous relatives belong to the Lily family. Some of these alliums are distinctly ornamental; a few others, notably garlic, leek, Welsh onion, and chive, are common vegetables. All of the edible forms have related flavors and odors that are due principally to a volatile, irritating substance.

Answer 7

the underground bulb at it's roots...

Answer 8

lilly has  onion  like structure inside the ground just like the onion.