What's the difference between lectionary and lector?

Lectionary

Definition:

• (n.) A book, or a list, of lections, for reading in divine service.

Example Sentences:

Lector

Definition:

• (n.) A reader of lections; formerly, a person designated to read lessons to the illiterate.

Example Sentences:

• (1) GuardianWitness es el hogar para el contenido de los lectores de The Guardian.
• (2) Nos gustaría oír de lectores que están en los países afectados por el virus del zika.
• (3) (Caveat lector - do not read this book before going to sleep.)