difference between noun and subject

[Lordy]

English Language Tests, Intermediate level

ESL/EFL Test #259 "Irregular Verbs Test (7)", question 1

Every year, Canadian geese ......... south for the winter so they must have a lot of endurance.

(a) fly
(b) flies
(c) flown

English Language Tests, Intermediate level

ESL/EFL Test #259 "Irregular Verbs Test (7)", answer 1

Every year, Canadian geese fly south for the winter so they must have a lot of endurance.

Correct answer: (a) fly
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Which is the different between noun and subject?

Lordy

[Mister Micawber]

.
A noun is a word class, a part of speech (noun, verb, adjective, adverb, preposition, conjunction, interjection).
A subject is a word function in a sentence. (The boy (Subject) is bald.)

Subjects are usually if not always nouns (Chicago is my kind of town), noun phrases (The little fat boy in the corner is still hungry) or noun clauses (Whoever ate my sandwich is in big trouble!)
.
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Native English teacher at Mister Micawber's