Should vs. Must

Shouldverb

(auxiliary) Be obliged to; have an obligation to; indicates that the subject of the sentence has some obligation to execute the sentence predicate or that the speaker has some strong advice but has no authority to enforce it.

Shouldverb

(auxiliary) ought to; speaker's opinion, or advice that an action is correct, beneficial, or desirable.

Shouldverb

(auxiliary) Will be likely to (become or do something); indicates a degree of possibility or probability that the subject of the sentence is likely to execute the sentence predicate.

Shouldverb

Used as a variant of the present subjunctive.

Shouldverb

(auxiliary) shall

Shouldverb

A variant of would when used with first person subjects.

Shouldnoun

A statement of what ought to be the case as opposed to what is the case.

Should

Used as an auxiliary verb, to express a conditional or contingent act or state, or as a supposition of an actual fact; also, to express moral obligation (see Shall); e. g.: they should have come last week; if I should go; I should think you could go.

Mustverb

To do with certainty; indicates that the speaker is certain that the subject will have executed the predicate.

Mustverb

To do as a requirement; indicates that the sentence subject is required as an imperative or directive to execute the sentence predicate, with failure to do so resulting in a negative consequence.

Mustverb

said about something that is very likely, probable, or certain to be true

Mustverb

(transitive) To make musty.

Mustverb

(intransitive) To become musty.

Mustnoun

Something that is mandatory or required.

Mustnoun

The property of being stale or musty.

Mustnoun

Something that exhibits the property of being stale or musty.

Mustnoun

Fruit juice that will ferment or has fermented, usually grapes.

Mustnoun

A time during which male elephants exhibit increased levels of sexual activity and aggressiveness also spelled musth.

Mustnoun

An elephant in this sexual and aggressive state.

Must

To be obliged; to be necessitated; - expressing either physical or moral necessity; as, a man must eat for nourishment; we must submit to the laws.

Must

To be morally required; to be necessary or essential to a certain quality, character, end, or result; as, he must reconsider the matter; he must have been insane.

Mustnoun

The expressed juice of the grape, or other fruit, before fermentation.

Mustnoun

Mustiness.

Mustverb

To make musty; to become musty.

Mustadjective

Being in a condition of dangerous frenzy, usually connected with sexual excitement; - said of adult male elephants which become so at irregular intervals, typicaly due to increased testosterone levels.

Mustnoun

a necessary or essential thing;

Mustnoun

grape juice before or during fermentation

Mustnoun

the quality of smelling or tasting old or stale or mouldy

Mustadjective

highly recommended;

Must

Must (from the Latin vinum mustum, ) is freshly crushed fruit juice (usually grape juice) that contains the skins, seeds, and stems of the fruit. The solid portion of the must is called pomace and typically makes up 7–23% of the total weight of the must.