To a naive planespotter, it is only the difference between the sizes of the aircraft that is very clearly observable. Other details which help experienced planespotters identify planes quickly, are acquired by understanding the basic designs in a detailed manner.
Boeing 777, thus, is easily identifiable, mainly because it is a large single deck plane. We have delved deep into the identifying features of the 777 in this article.
Boeing 777, or Triple 7, or T7, uses General Electric GE90, Pratt & Whitney PW4000, or Rolls-Royce Trent 800 engines, depending upon the airlines to choose. All of these are fairly large engines. However, the GE90 is the biggest of the three.
The below picture provides a perspective of how large the T7 engines are:

In comparison, here is how big a Boeing 737 engine is:

Aviation, truly, is mesmerising!
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Cover Credits: I, Bubinator, CC BY 2.5, https://commons.wikimedia.org/w/index.php?curid=2445175