What is the difference between the words order, state and structure?

Answer 1

In science,
'Order' is the logical or comprehensible arrangement of separate elements of a group (chemistry), or is the taxonomic group (in biology) containing one or more families of a species.
'State' refers to the three traditional states of matter (chemistry) - which include solids (fixed shape and volume) and liquids (fixed volume and shaped by the container) and gases (filling the container).
And 'Structure' is the manner of construction of something and the disposition of its parts (engineering), or the complex composition of different elements into their compounds (chemistry).

Answer 2

Is this a philosophical question? the difference is that they are all different ways of describing the "being" of something.. like a sentence, or other grouping.