Portia Woodman scored what is believed to be a Women's Rugby World Cup record eight tries as New Zealand thrashed Hong Kong 121-0.

The Kaikohe winger was nearly impossible to stop as the Black Ferns flexed their attacking muscles to dominate their opposition.

Woodman scored four of her eight tries in the final 10 minutes as her speed and strength couldn't be matched as she left a sea of fledgling defenders in her wake.

The Black Ferns have put hapless Hong Kong to the sword. Source: NZ Rugby

A humble Woodhouse had plenty of praise for her teammates.

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"A little bit knackered. I think we were doing a conditioning session after a while. It's all down to the girls on the inside. They're working in the middle and I get all the glory at the end just to finish it off."

"The score does reflect our work but for Hong Kong it doesn't reflect what they were doing. They worked hard on defence and attack and they just kept going right up to the 80th minute. Unfortunately it doesn't reflect how hard they were working."

Woodman was one five-pointer short of the Black Ferns record, held by Vanessa Coote who scored nine tries against France in 1996.

The Black Ferns scored 19 tries - 16 from the backline - as Hong Kong fell to their second heavy defeat in as many games after going down to Canada 98-0 in their opener.

Kendra Cocksedge had a welcome return to form with the boot after a disappointing return in their 44-12 win over Wales.

The halfback kicked 13 conversions to go with a try in a 33-point haul.

Because of their massive points differential, New Zealand are virtually guaranteed a place in the semi-finals, regardless the result of their last pool game against world No.3 Canada on Thursday.

The Canadians beat Wales 15-0 to join New Zealand, defending champions England, the United States and Ireland as unbeaten teams after two rounds of matches.