Knowing the origin of the names given to chords will help you remember their structure:

  Origin of the Name
Dominant Seventh The chord is built on the dominant degree of the major, harmonic and melodic minor scales.
Major Seventh The triad and the seventh are major.
Minor Seventh The triad and the seventh are minor.
Diminished Seventh The triad and the seventh are diminished.
Half Diminished Seventh The triad is diminished, but the seventh. is minor, so it is half diminished.

As shown in the table above, dominant sevenths are called by the name of the scale degree on which they are formed. Major, minor, and diminished sevenths are named according to the type of triad and the seventh interval on which they are based.

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José Rodríguez Alvira.