Not the same number of syllables, but: conjectures, prefectures.
Some words that rhyme with "lectures" are textures, conjectures, and ruptures.
prefecture
There is no standard collective noun for the noun lectures, in which case a noun suitable for the situation is used; for example, a series of lectures, a program of lectures, a yawn of lectures, etc.
He was giving his usual course of Advanced Emotional Engineering for Third Year Students. Twelve lectures, of which the seventh is about rhymes. He included propaganda and the principal was mad.
you can download lectures from internet
Fashionable Lectures was created in 1872.
Lectures on Faith was created in 1835.
Gifford Lectures was created in 1898.
Guildhall Lectures was created in 1959.
Tarner Lectures was created in 1916.
Warburton Lectures was created in 1768.
Bampton Lectures was created in 1780.
Hulsean Lectures was created in 1820.
Donnellan Lectures was created in 1794.