Firstly, secondly, thirdly …

(a), (b), (c) …

(i), (ii), (iii) …

On the one hand …, on the other hand …

both …, and …

as well as …

not only …, but also …

… or, for that matter, …

Just as …, …

Comparison of …

compared with or to …

To give a comparison from …,

… has been compared or likened to …

… is or are often compared to or with …

… are broadly comparable

comparatively few

relatively speaking

It is interesting to compare …

For comparison, we also examined …

Comparison of … revealed that …

The results were compared with or to those obtained in or by …

a comparative study or investigation of …

Equal or equivalent

… equals …

… is equal to …

… is equivalent to …

to equate … with …

the terms … and … are used interchangeably

Equally, …

It is equally clear that …

in equilibrium

On balance, …

to strike a balance between … and …

in parallel

… parallels …

… is paralleled by …

a parallel process of …

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