The spell states that:
You speak a one-word command to a creature you can see within range.
and the spell requires a Verbal component.
When I cast this spell, is the one-word command the only verbal component?
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1.With reference to Verbal components in general:
'Most spells require the chanting of mystic words. The words themselves aren’t the source of the spell’s power; rather, the particular combination of sounds, with specific pitch and resonance, sets the threads of magic in motion.' (SRD p.101)
So, the spell Command requires the chanting of 'mystic words', this has a couple of implications:
2.Furthermore, regarding Command specifically:
'The spell has no effect if the target is undead, if it doesn’t understand your language, or if your command is directly harmful to it.' (SRD p.125)
So the command in this spell must be intelligible to the target. 'Mystic words' implies that to the vast majority of hearers, the verbal component of a spell is not intelligible. So, if people had to understand the mystic words in order to be affected by the spell, it would render it almost useless.
3.Support from rulings on similar spells:
For further evidence of this ruling, see this similar question regarding the Suggestion spell and specifically this text from the Sage Advice Compendium about Suggestion:
Verbal components are mystic words (PH, 203), not normal speech. The spell’s suggestion is an intelligible utterance that is separate from the verbal component (SAC p.15)
The spell Suggestion's suggestion is not part of its verbal components, so it makes sense for the same to be true of Command's command.
While it isn't RAW, a DM could allow the one-word-command, of the spell Command, to function as that spell's verbal component in their game.
As the 'mystic words' are normally the only componenet of this spell, a DM that removed the mystic words might find that doing so complicated the question of whether or not an observer would be able to perceive that a spell had even been cast. If they ruled that casting Command became imperceptible to an observer (it's only component now being a perfectly intellible phrase) then that would represent a strong buff to this spell, under the right conditions. Unless ruthlessly exploited, however, even this is unlikely to be game-breaking (though it could be an interesting tool to give a BBEG).
In general though, spell components are there to help balance spellcasting, in terms of action economy and cost. So, extrapolating this exception and applying this principle to other spells (amalgamating or removing components), as a consequence of this ruling, could cause wider balance issues long term.
Here is Jeremy Crawford's answer on Sageadvice for similar spell - Suggestion:
Sentence in "Suggestion" spell (and others) contains V component or needs additional words? @GromHall
Verbal components are mystic words (PH, 203). The spell's suggestion is a separate, intelligible utterance. @JeremyECrawford
Suggestion and Command both requires Verbal component and speaking something that must be understood by the target, thus the same rule can be applied:
The spell's one-word-command is a separate, intelligible utterance.
When a spell requires a verbal component, it always require completing the mystic words, then do as the spell says (the one word command).