different between voluminous vs lengthy

English

From Late Latin voluminosus, from volumen, from volv? (“roll, turn about”) +? -men (noun-forming suffix). Related to volume.

voluminous (comparative more voluminous, superlative most voluminous)

Of or pertaining to volume or volumes.
Consisting of many folds, coils, or convolutions.
Of great volume, or bulk; large.
Having written much, or produced many volumes
Synonyms: copious, diffuse
a voluminous writer

From length +? -y.

lengthy (comparative lengthier, superlative lengthiest)

Having length; long and overextended, especially in time rather than dimension.
a lengthy text
a lengthy discussion
a laborious and lengthy process
She died last night after a lengthy illness.
They received lengthy prison terms.
Speaking or writing at length; long-winded.
- 1863, John Cumming, Driftwood, seaweed and fallen leaves (volume 1, page 92)
  If, in addition to being a lengthy preacher, he had also been a Rev. Mr. Mumbles or a Rev. Dr. Drone, the penance thus endured by his people would have been intolerably severe.

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