Wire opened the scoring after King offloaded to England international Ashton to dot down in the corner.
Scrum-half Williams then played a superb ball over to Ashton to score his and Wire’s second.
Ashton thought he had his hat-trick within 20 minutes but the TMO decided that he was just taken into touch by a terrific last-ditch tackle from Giants’ Tui Lolohea.
Danny Walker’s superb kick behind the Huddersfield defence then earned Wire a 40/20 which allowed the opportunity for Ben Currie to offload superbly to the on-rushing James Harrington to crash over under the sticks.
England captain Williams then dived over at the side of the posts to put Wire 24 points clear just after the half-hour mark.
Canberra Raiders-bound Nicholson got his first of the match after breaking through some weak Giants defending to crash over and two minutes later, a catalogue of errors from Giants’ Lolohea and then Aidan McGowan allowed Taylor-Wray to dot down his first.
Five minutes into the second half, Giants’ 19-year-old Jack Billington, making his full debut, was sent to the sin-bin for 10 minutes for a high tackle.
In his absence, Thewlis weaved inside the Giants defence to get a well-deserved try of his own following an excellent performance with the boot which saw him land nine goals in total.
Ashton then completed his hat-trick before teenage sensation Taylor-Wray scored his second of the match under the posts.
Five minutes later, Toby King was too strong for the Giants defence as he crashed over against his former club to score his ninth Super League try of the season.
Nicholson then went over for Wire for his second before Tai ran from deep to go alone and roll over the line to complete the scoring in a superb team display.
