most, -est

(physics) top quark

(physics) an elementary particle

physics (as an area of study)

a quark (an elementary subatomic particle which forms matter)

heavy / (of computers or programs) sluggish; slow / (of computer networks) congested; having poor performance

physics, the physical aspects of a phenomenon or a system

a division / something that divides two objects

the number of overlaps; fold, layer

main, principal, important