What is another word for tetrad?

There isn't a single perfect synonym for "tetrad" because its meaning depends on the context. Here are some options depending on the specific situation:

General meaning (a group of four):

* Quartet

* Quadruplet

* Four-some

* Group of four

Biology:

* Tetralogy (refers to a group of four connected things, especially in biological contexts)

* Four-part structure

* Tetrad of chromosomes (specifically referring to four chromosomes)

Chemistry:

* Tetragon (a four-sided figure)

Other:

* Quadriad (a group of four things)

* Tetramer (a molecule consisting of four identical subunits)

To get the most accurate replacement for "tetrad," provide more context about its usage.