If you’re lucky enough to have a spare $30,000 sitting in a supposedly high interest bank account, I would suggest you put it to better use and invest it in the share market.

Although the share market may be higher risk than a savings account, I believe the risk/reward on offer justifies this. There are a number of high-quality growth shares which I feel will easily outperform high interest savings accounts over the next five years.

Here are four growth shares that I would invest this money evenly in:

BWX Ltd (ASX: BWX)

I was very impressed with the personal care company’s performance in FY 2016. Strong sales growth led to a 25% jump in net profit after tax to $12 million. Its Sukin skincare range was the big driver of growth with a 40% jump in sales year on year. With the Sukin range of products growing its presence online in China and recently launching in Boots pharmacies in the UK, I believe this strong growth can continue for some time still.

Corporate Travel Management Ltd (ASX: CTD)

This leading corporate travel company has grown at an incredible rate in recent years through strong organic growth and earnings accretive acquisitions. The good news is that management expects this to continue in FY 2017 and has forecast EBITDA in the range of $85 million to $90 million. This will represent year-on-year growth of between 23% and 30%. Although it doesn’t come cheap at 27x estimated FY 2017’s earnings, I believe it is a great buy and hold investment.

Nanosonics Ltd. (ASX: NAN)

This infection prevention specialist has had a great start to FY 2017. At the end of October Nanosonics reported that first quarter sales were up 174% on the prior corresponding period to $17.8 million thanks to the growing demand for the company’s trophon EPR product. Nanosonics’ environmentally friendly trophon EPR is completely effective at disinfecting ultrasound probes, compared to ineffective current toxic disinfectants which are being used.

Treasury Wine Estates Ltd (ASX: TWE)

Although I wouldn’t expect this leading wine company to replicate this year’s incredible 131% rise in net profit any time soon, I do expect the growing demand for its products across the world will keep its earnings growth strong for a number of years to come. Organic growth and the recently acquired Sterling Vineyards, Beaulieu Vineyard, and Blossom Hill brands should help the company achieve this in my opinion.

If you'd rather invest for income and are interested in quality dividend shares then I would recommend this top dividend share instead. A strong yield and potential share price gains make this a great investment idea in my opinion.

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Motley Fool contributor James Mickleboro has no position in any stocks mentioned. The Motley Fool Australia owns shares of Corporate Travel Management Limited and Nanosonics Limited. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy. This article contains general investment advice only (under AFSL 400691). Authorised by Bruce Jackson.